▎ 摘　　要

Due to its harmful nature, carbon monoxide (CO) should be detected at low temperature and in a wide range of CO concentration. A sensor based on WO3-graphene nanocomposite synthesized by the solvothermal method has been developed. Based on material characterizations, the synthesized monoclinical WO3 has a nanowire shape. The presence of graphene interestingly promoted the formation of the WO3 hexagonal structure as a minor phase in the composite. The gas sensor measurements were carried out at three different temperatures, 300 degrees C, 150 degrees C, and room temperature. It was found that at 300 degrees C, the composite with ratio WO3:graphene 2:1 or WG21 produces a 21.5 response value to 10 ppm of CO, which is higher than the other composites. The response and recovery times of WG21 are 16 and similar to 4.4 min, respectively. The WG21 nanocomposite was also found to show a good sensitivity in the range concentration of 10-300 ppm. [GRAPHICS]